Granted Patent
Utility
US 5,851,451 · App. 08/766,611
Production of microspheres
Inventors:
Nobuyuki Takechi, Seiji Ohtani, Akihiro Nagai
Patented Case
View Patent ↗
Granted: Dec 22, 1998
Filed: Dec 13, 1996
Inventors
Nobuyuki Takechi
Seiji Ohtani
Akihiro Nagai
Assignee (at issue)
Takeda Chemical Industries Ltd.
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.